S(t)=t³/3-4t²+21t-6
v(t)=S'(t)=t²-8t+21=(t²-8t+16)+5=(t-4)²+5 ⇒ v(min)=5м/с при t=4с.
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S(t)=t³/3-4t²+21t-6
v(t)=S'(t)=t²-8t+21=(t²-8t+16)+5=(t-4)²+5 ⇒ v(min)=5м/с при t=4с.